| 초록 |
One of the major problems of magnetorheological fluids (MR fluids) is anti-sedimentation property. Because the density of magnetic particle is much larger than the density of the carrier liquid, sedimentation of magnetic particle occurs, and this phenomena can degrade the performance of MR fluids. In this research, to lower the density of magnetic particles, we synthesized SiO2@PMAA@Fe3O4 particles using silica microspheres as hard templates. By examining morphology and structure, we concluded that synthesized particles have core-shell structures with mesoporous shells. The density of the synthesized core-shell particles was measured by piconometer and compared to that of Fe3O4. The density of SiO2@PMAA@Fe3O4 core-shell particle was 54 % of the density of Fe3O4, which means anti-sedimentation property of MR fluid based on SiO2@PMAA@Fe3O4 was improved from compared to MR fluid based on Fe3O4. |
